Questionok, I have a 94 Regal. It will start just fine, will run for about 2 seconds, and die. will restart with no problem, run 2 seconds and die. I have replaced everything but the correct thing... he he he. What I have replaced is: Fuel pump, computer, control module and coil pack, plugs, wires, TPS, MAF, Crank sensor, cam sensor, fuel filter, fuel pressure regulator, Here's the diagnosis. It stores no codes. I can attach a plug to a wire, and it will spark till the engine stops rotating, so I doubt it's a spark problem, actually, I'm sure it isn't. I say this because I can feed fuel in through the air intake, and it will run till I stop feeding it fuel.. Conclusion? fuel delivery problem. I have checked fuel pressure, consistant between 40 and 45. I have checked power at the injectors, have power. Checked pulse at injectors with a test light, and light will flash, and flash when running by dumping in fuel. I have fuel pressure at the injectors, and my injectors do click by triggering them with my test light. The problem was immediate, not some slow decline. Ran great, then, Just up and died. so chances of 6 bad injectors at once doesn't seem feezable. I'm baffled here, any ideas?
AnswerHello Rick,
I would like to know for sure if the fuel pressure remains at 40 to 45 till AFTER it dies, or just at the same time that it dies.
There is an oil pressure switch that runs the fuel pump after engine oil pressure reaches 4 PSI.
I honestly am not sure if the fuel pump relay stays energized after the engine starts or not. I thought it stayed energized as long as there was a crank signal, but I have heard otherwise... that it just runs on the oil pressure switch, which might be bad, or unhooked.
So make sure the pump is running till after it dies.
Van
